Some have focused on speed; others have focused on thoroughness. Each approach has its advantages and potential pitfalls, grounded in the inherent tension between getting timely results and measuring public opinion in a broader and deeper fashion.
A shorter period in the field can exaggerate a problem common to all polls: an inadvertent bias toward voters who are highly engaged and more likely to participate in polling. This could decrease accuracy in a race that could be decided by disengaged voters.
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